Which issue is the Chinese song that Charlie sang well? What's the problem?

Season 4, issue 5. According to Tencent's video query, the Running Man family invited Charlie, Silent King to participate in the fifth program of Run 4. It was recorded in Guilin, Guangxi, where folk songs are very famous. All three guests appeared in the form of singing, among which Charlie sang Hao Han songs. "Run" is an outdoor competitive reality show launched by Zhejiang Satellite TV, which is produced by Zhejiang Satellite TV Program Center.